/Engine/Source/Runtime/MovieScene/Public/Channels/MovieSceneChannelProxy.h
template<typename ChannelType, typename ExtendedEditorDataType> void SetExtendedEditorData ( [FMovieSceneChannelHandle](API\Runtime\MovieScene\Channels\FMovieSceneChannelHandle) ChannelHandle, ExtendedEditorDataType && InExtendedEditorData )